What is safe maximum time for storage of kidney?
**Core Concept**
The safe maximum time for storage of a kidney is crucial in transplant surgery, as it directly affects the viability and function of the organ post-transplantation. This concept is rooted in **ischemic tolerance** and **organ preservation** techniques. The storage time is limited due to the sensitivity of renal tissue to **hypoxia** and **ischemia**.
**Why the Correct Answer is Right**
The correct answer is based on the principles of **static cold storage**, which is a common method used to preserve kidneys before transplantation. This method involves cooling the organ to reduce metabolic activity, thereby minimizing tissue damage from **ischemia**. The safe storage time is generally considered to be up to 72 hours, although outcomes are best when the storage time is minimized.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it underestimates the safe storage time, potentially leading to unnecessary urgency and stress on the transplantation process.
**Option B:** This option overestimates the safe storage time, which could result in decreased organ viability due to prolonged **ischemia**.
**Option D:** Similarly, this option exceeds the recommended storage duration, risking organ dysfunction.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **cold ischemia time** should be minimized to optimize graft function and patient outcomes. Prolonged storage increases the risk of **delayed graft function** and decreases long-term survival of the transplanted kidney.
**Correct Answer:** C. 72 hours